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[Meaning] sparse, light, cheap.[1]
"Learning from the report of a deserter that [the Syracusans] were observing a public festival and eating bread frugally -- because it was scarce -- but drinking wine freely, [Marcellus] began the siege."[2]

[1] Headword and glosses are dative plurals of these adjectives. The headword one might be extracted from the quotation given (where the relevant phrase is literally "eating frugal breads"); however, other lexica (see the references at Photius lambda358 Theodoridis) do not have the quotation, but do have this headword with the second and third of the Suda's glosses.
[2] Polybius 8.37.2 (abridged: web address 1), on the Roman siege of Syracuse in 216 BCE.